“fill-for-life” transmission often means “fill for the life of the warranty.” Even in a “fill-for-life” transmission, it’s a good idea to have the fluid changed, especially when vehicles fall under the severe service designation.

Your mechanic actually does not know much about lubricants. They know that selling Amsoil does not work for them. They have people coming in 3-5 times a year for an oil change now they come in once a year. Not good for business. It goes deeper than that.